liver fluke vs trematode

liver fluke and trematode both are nouns.

Word	Noun	Adjective	Verb	Adverb
liver fluke	Yes	No	No	No
trematode	Yes	No	No	No

As nouns, trematode is a hypernym of liver fluke; that is, trematode is a word with a broader meaning than liver fluke:

liver fluke: flatworm parasitic in liver and bile ducts of domestic animals and humans
trematode: parasitic flatworms having external suckers for attaching to a host

Other hypernyms of liver fluke include fluke, trematode worm.

liver fluke (noun)	trematode (noun)
flatworm parasitic in liver and bile ducts of domestic animals and humans	parasitic flatworms having external suckers for attaching to a host